.header{
    height: 44px;
    line-height: 44px;
    text-align: center;
    background-color: #fff;
}
.main{
    background: url('../img/advertisement-bg.jpg') no-repeat;
    background-position: center top;
    background-size: 1000px;
}

// 倒计时
.count-down{
    position: fixed;
    top: 72px;
    right: 10px;
    width: 106px;
    height: 40px;
    line-height: 40px;
    text-align: center;
    border-radius: 20px;
    border: 1px solid #ccc;
    background-color: #fff;
}

// 标语
.solgan{ 
    opacity: 0;
    width: 240px;
    height: 64px;
    font-size: 48px;
    color: #fff;
    position: absolute;
    bottom: 100px;
    left: 50%;
    margin-left: -120px;
    // 执行动画
    animation:solgan 3s forwards
}

// 动画规则
@keyframes solgan{
    0%{
        opacity: 0;
    }
    100%{
        opacity: 1;
        bottom: 50px;
    }
}